My great grandfather was Robert Pettit born about 1860 m. Annie Donovan.His father was John Wesley Pettit b. 2-26-1823 according to the Forbell Bible. He married Rebecca Smith daughter of Joseph Smith from Ireland.
John Wesley Pettit's sister Maria Louise m. Joshua Hitchcock. the Hitchcock's & John Wesley Pettit's are buriedin adjacent plots in Cypress Hills Cemetery.
John Wesley Pettit's sister Ann Elizabeth m. Henry Barlow. They had nine children.I know only that Mary A. m. Abraham Bloodgood Van Nostrand.
John Wesley's brother Andrew Jackson m. a Maria.They lived in Staten Island about 1850- but I never could find them in a Census.
Elizabeth Forbell's parents were Henry Forbell & Ann Morrell, a daughter of Revolutionary war Patriot, Isaac Morrell.
I have much more. Give me some info on your family.